Ng generate m3-theme documentation is missing

[stot3]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

You reference that a m3 theme can be generate based on a color and I can't use it because the README link is broken. It seems like such a useful tool but I can't find it anywhere on google.

Reproduction

StackBlitz link:
Steps to reproduce:

1. Go to https://material.angular.io/guide/theming
2. Click the link, "Learn more about this schematic in its" documentation.

Expected Behavior

I'm trying to get more information about the ng generate m3-theme schematic.

Actual Behavior

Broken link

Environment

Web docs.

[crisbeto]

Fixed by #29935.

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